In API example project(dw1000_api_rev2p14_stsw), there is a constant defined as UUS_TO_DWT_TIME 65536. Explanation in the comment section not describing this. How this value is derived?
/* UWB microsecond (uus) to device time unit (dtu, around 15.65 ps) conversion factor. 1 uus = 512 / 499.2 µs and 1 µs = 499.2 * 128 dtu. */
#define UUS_TO_DWT_TIME 65536